Benchmark: Object property: delete vs undefined 2

Tests:

Delete
const obj = { a:1, b:2, c:3 }; delete obj.b;
Set undefined
const obj = { a:1, b:2, c:3 }; obj.b = undefined;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Delete
Set undefined

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
Delete	6406506.0 Ops/sec
Set undefined	118050408.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its options.

**Benchmark Definition JSON**

The benchmark definition provides information about the test case. In this case, there is only one benchmark definition:

```json
{
  "Name": "Object property: delete vs undefined 2",
  "Description": null,
  "Script Preparation Code": null,
  "Html Preparation Code": null
}
```

This JSON defines a test case that compares two approaches for deleting an object property.

**Individual Test Cases**

There are only two individual test cases:

1. **Delete**: This test case uses the `delete` operator to delete a property from an object.

```javascript
const obj = { a:1, b:2, c:3 };
delete obj.b;
```

2. **Set undefined**: This test case sets a property to `undefined` using the assignment operator.

```javascript
const obj = { a:1, b:2, c:3 };
obj.b = undefined;
```

**Options being compared**

The two options being compared are:

* Using the `delete` operator to delete a property.
* Setting a property to `undefined` using the assignment operator.

**Pros and Cons of each approach**

Here's a brief overview of the pros and cons of each approach:

1. **Delete**:
	* Pros:
		+ More concise and readable syntax.
		+ Can be more efficient in some cases, as it doesn't require creating a new object or using the `Object.delete` method.
	* Cons:
		+ Not all browsers support the `delete` operator for property deletion. For example, older versions of Internet Explorer do not support it.
2. **Set undefined**:
	* Pros:
		+ More widely supported, as it's a standard JavaScript assignment operation.
		+ Works in all modern browsers and versions of Internet Explorer.
	* Cons:
		+ Requires more code to achieve the same result (i.e., `obj.b = undefined;` vs. `delete obj.b;`).

**Library usage**

None of the test cases use any libraries or external dependencies.

**Special JS features/syntax**

There are no special JavaScript features or syntax used in these benchmark test cases. They rely solely on standard JavaScript operations.

**Other alternatives**

If you wanted to compare other approaches for deleting a property, some alternative options could include:

* Using `Object.delete` (not supported in older browsers).
* Creating a new object with the desired properties and assigning it to a new variable (e.g., `const newObj = { b: undefined }; const objNew = { ...obj, ...newObj }; delete obj.b;`).
* Using a library like Lodash's `unset` function.

Keep in mind that these alternative approaches may introduce additional complexity or performance overhead and should be carefully considered depending on the specific use case.

Related benchmarks:

Object property: delete vs undefined 2 (version: 1)

Comparing performance of: Delete vs Set undefined

Created: 3 years ago by: Registered User

Jump to the latest result

Delete

Set undefined

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):